# OAR Box 1107 Prepped by Ollie Stewart



### Document

Number: 

# 60 ) IV-B-1 0

Docket Number: 

# A-81-2 1

Printed 4/11/20083:03:4 7

PM Sheet 60of 90 P. 1P. 2

^ S O ST4. 

# A-8I-2 I
IV-B-1 0

UNITE D STATE S ENVIRONMENTA L PROTECTIO N AGENC Y

Offic e o f Ai rQualit yPlannin g an d Standard s Researc h Triangl e Park , Nort h Carolin a 2771 1


### 2 I 

### MA R198 6 MEMORANDU M SUBJECT :

FROM :

TO : Discussio nwit hVIST A Chemical s Concernin g Commen t o n Viny l Chlorid e Standar dRevision s

:*# Fre dDimmick ' Standard s Developmen t Branc h(MD-13 ) File s O nOctobe r 16 , 1985 , Mr . Lesli e Evan s an d I calle dMr . Josep hLedvin a o f VIST A Chemica l Company

t o discus s VISTA' s respons e t o a previou s reques t I nVISTA' s response , Mr . Ledvin a ha d indicate dtha t pipin g an

d valve s woul db e require di f VIST A wer e t o requirement s fo r open-ende dvalve s o r line s in 4 0 CF R Par t 6 1 Subpar t V . Th e engineerin g basi s associate dwit hthi s retrofit ting , in particular , a t polyviny l chlorid e (PVC ) plant s wa s discussed . fo r information , retrofittin g o f compl y wit hth e

Mr . Ledvin a wit hth e hel po f hi s staf f explaine dth e basi s fo r retrofittin g o f pipin g an d valve s fo r PVC plants . Basically , thre e pertinen t situation s occu r i n PV C plant s wher e "capping " o r "valving " an open-ende dlin e o r valv e in viny l chlorid e (VC ) servic e woul db e required . First , standar dopen-ende dline s o r valve s ar e use dt o allow ai r int o PVC reactor s whe nth e reacto r i s dumpe d(i.e. , whe nPV C i s droppe dthroug ha valv e an

d pipin g t o furthe r processing) . Second , RA M valve s (positiv e displacemen t fee dvalve s tha t ha s a n open-end ) ar e use dt o charg e th e reacto r wit hcatalysts . Third , bloc k valve s connecte dt o a commo nheade r ar e use di n a multi-purpos e system s t o fee dth e VC t o th e reactor , t o dum pth e PVC , t o fee dwate r use dt o clea nth e reacto r an d t o remov e th e wate r from

th e reacto r afte r cleaning ; thi s system i s diagramme din Figur e 1 . Othe r suc hmultipurpos e system s exist . VIST A wa s concerne dabou t severa l particula r valve s i n thei r PV C plants . Eac hreacto r in a PVC plan t ma y hav e a commo nheade r an d valve s use da s a multipurpos e system fo r feeding , dumping , washing , an d drainin g th e reactor ; fou r open-ende dline s o r valve s woul db e involved . Eac h reacto r ma y

hav e a commo nheade r an d valve s use din th e evacuation / recover y system ; tw o open-ende dline s o r valve s woul db e involved . Eac hreacto r woul dhav e on e ai r in-tak e valve . Two reactor s us e a RA M valv e t o charg e catalys t int o thes e reactors ; two open-ende dline s o r valve s ar e involved . A three-wa y

valv e i s use di n th e batc hwate r strippin gP. 3

system t o direc t wate r fro m on e o f two stripper s t o on e receiver/storag e vessel . Th e valve s o nth e feeding , dumping , washing , an ddrainin g system ar e 6 " valves ; an

dconsiderabl e repipin g an dreconstructin g th e existin g pipewa y woul db e neede dt o ad dextr a valves . Th e othe r valve s ar e 3 " valve s an

dwoul dno t nee drepipin g t o ad dth e extr a valve .
cc : Lesli e Evans , CP B (MD-13 ) K . C . Hustvedt , CP B (MD-13 ) Kare nFidler , Radia nP. 4

FIGUR E 1

Sewe r 1 Drai n Was h 2 Wate r PVC Dum p V C 4 Charg e